In a short paper such as the one we are discussing (based as it is on a large amount of original work), it is not possible to answer many of the questions that may arise in the mind of any one reader. When Dr. Work consults the bibliography of the article in question, he will find that reference 3 ("Analyzing Children's Art," available in January 1968) discusses the work of Bender, Frostig, and many others who have examined child art extensively.